Dustguard



7 F. HuFNAGEg DUSTGUARD Filed June 4, 1521 Patented July 29, 1924,

FRED HUFNAGEL, 0F ST. LOUIS, MISSOURI DUSTG'UARD.

Application led June 4,

To all whom t may concern: Y

Be it known that I, FRED HUFNAGEL, a citizen of the United States, residing at the city of St. Louis, in theState of Missouri, have invented certain new and useful Improvements in Dustguards, of which the following is a specification.-

This invention is intended to prevent dust from settling on exposed parts of an overhead-valve motor. It not only saves considerable time and a great deal of labor heretofore expended in cleaning the parts, but also saves them from wearing out and the expense of putting in new ones, and, also,

eliminates a great deal of noise, as it makes a more compact compartment'and does away with the loose contact of parts worn on account of dust.

This dustguard is preferably of tin, but any suitable material may be used. One advantage of using tin is that it can easily be ybent to the necessary form. The various plates shown in the drawings and herein described are so located, shaped, and fastened that they not only inclose all exterior moving parts of an overheadvalve engine, but in addition prevent access of dust thereto, which prevents dust from sifting within the said inclosure and settling upon the said parts. The object is,`not only to insure better action of the parts that arises from freedom from dust but, also, to prevent the greater wear and tear that the presence of dust produces. Not only does the presence of dust increase friction and wear but, also, it mixes with any oil presentand gums the parts and retards their action.

Inrgeneral this invention is a tight fitting casing neatly inclosing the sides and top of the engine-block and connectedrparts. It is knot a mere box, as such a box would be loose and rattle. One thing highly undesirable in a motor is any kind of noise. Therefore, this casing is formed of a plurality of plates that closely fit and are tightly fastened to -thefengine at the diierent points where certain of its parts are exposed to the settling of dust. In such a construction it is necessary to provide not only for tight attachment, but, also, for easy removal of most of the parts constituting the casing, so as to permit oiling 'and adjustment of the parts that are covered thereby, and, also, access thereto for the purpose of repairs, replacements, or the like.

In the accompanying drawings forming part of lthis specification, in which like num- 1921. Serial No. 475,175.

motor with the dustcaps or guards of the presentv invention, some of the guard sections or covers being removed;

Figure 2 is a top plan view of an enginev with the said caps in place;

Figure 3 is a section taken on the line v3 3 in Figure 1, showing the insulation of the sparkplungs; and

Figure 4`is a-detailfof the base connection n of the dustcap to the engine-block,A taken on the line 4.-4 in Figure 1.

The cam-shaft 1 passes through a` casting 2, to which casting is fasteneda bent piece of metal 3 containing a deep groove 4, which piece of metal or bent plate 3 is attached to the casting 2 by bolts 5.

The plate 3 is formed with a base-part that rests upon the crank-case and two Vertically up-turned parts 6 and 7. The part 6 is lower than and in front of the part 7 The bolt '5 passes through a slot 8 in plate 9 and through an opening 10 in member 7 and into casting 2, thereby vfastening plate 7 and with it member 3 and plate 6 to casting 2. A plate 9 has its lower end inserted in the groove 4, and its upperl end secured at its edges to the adjoining angle-members 24 by means of bolts or other suitable fastening means. rlhe slots 8, when plate 9 is in place, straddle the bolts 5, and the lower part of the said plate 9 lits into groove 4, as clearly shown in'Figure 4. Plate 9`has a rectangularl opening 11, at the side and bottom edges of which are outwardlyproject ing lips 43, secured to the outside of plate 9 by soldering on their outer periphery 44,

the inner periphery 45 of the said lips being separated from the said plate 9 to form a groove 46 in which slidably fits a door or cover-plate 47, which normally closes opening 11 in pla-te 9v-'and normally covers from dust the valve-litters 12. Without this inventionthesame are exposed to dust. With plate 47fin place they are covered therefrom. Where it is desired toy oil them it is an easy matter to raise plate 47 from the position shown on the left-hand in Figure 1 and to leave the opening 11 shown on the righthand in Figure 1. A lifter or handle or knob 13 makes raising or lowering of plate 47 easy.

As the sparkplugs 14 are located under the center of the front sidewall of the en gine-block 15, lbetween ythe valve-lifter rods` block 16, the said plates17 being attached.v

by t-liumbnuts 18 and bolts 2O to the front plates-21, the plate 21 having a bend 22 to accommodate a nut 23 on bolt 20. y j

The end plates 48 on both sides of the engine-block are held in place by anglemembers 24, which arelocated at the front and back, and the lower parts of which extend below the center of the engineblock 15 to the piston walls, the top of the said members 24 extending high enough to clear the valve-springs 25 and the rocker arms 26. A plurality of bolts and nuts counter-sunk and bolted fasten the members 24 and plates 48 together.

The rear-plate 27 forms the back of the casing and has a bent-iron plate or bracket 28f-riveted -at 30 to the same about at its center and extendingup and down. The said plate 27 is fastened by one of the engine-head bolts 29 running through the said bent-iron plate or bracket 28. The rear plate. 27 is fastened, also, by means of countersunk bolts and nuts to the inside oi the angle-members 24.

The edges of plates 27 and 48 overlap the flanges of angle-members 24 on the inside. Plates 21 at their lower edges are provided wit-hangular edges 32, and are fastened in place by the said edges fitting into a groove 33 in plate 9, and the said plates 21 are furthermore fastened in place to perpendicular extensions 34 of end-plates 48 by a thumbnut and bolt 35 at the top on each side. Plates 48 are fitted tightly against the crank case 49 at the bottom, thus formv ing a solid compartmentor inclosure at the lower end, thereby obviating rattling noises.

The `lower fore-plate 9 need never be removed after having once been put in place, because opening 11 therein is about six inches long by one and one-half inches high, thus .permitting oilingwhenever necessary of the valve-lifters 12.

Opening 11 is guarded with a live-eighth inch wide vertical metal plate-or strap forthe purpose of preventing plate or shutter-47 from slipping back and coming inte contact with the valve-lifters 12 in case of thesaid plate 47 accidentally getting out of position. The top-plate 38 is provided with a flange 39 and a handle 40, the said flange 39 overlapping the front-plates or foreplates 21 and rear plate 27 and end-plates 48, the said overlapping excluding dust. The top-plate 38 is fastened in place by thumbnuts and bolts 42 on each side thereof, the said bolts being secured to the endplates 48 and passing through the flange 39.

{avine' thus described this invention, l hereby reserve the benefit of all changes in form, arrangement, order, or use of' parts, as it is evident that many minor changes may be made therein without departing from the spirit of this invention or the scope of the following claims.

l claim:

1. A dustproof box for internal combustion engines comprising a plurality of plates suitably fastened together, said plates consisting of a top plate, a pair of side plates, rear and front plates, the said top plate provided with a fiange overlapping the side plates and rear and front plates, said side plates oeing held in assembled position by angle members and interfitting means engageable with said rear plates, said front plates comprising upper and lower members, said lower member provided with an opening, and a movable plate adapted adjustably to close said opening, and means for securing said lower plates in position.

2. A dustproof box for internal combustion engines comprising a casting, said casting secured to a metallic base plate, said base plate having vertically upturned members, one of said members being lower and in front of the other upturned member, a lower front plate provided with an opening, and with slots and having its lower end inserted between said upturned members, bolts passing through said slots and opening in said upturned member, side wall plates held in position by angle members secured by bolts, rear plates secured to the engine head and overlapping said side plates and fastened thereto, top plates provided with flanges, said fianges overlapping said side walls and rear yplates and front plates and fastened thereto, and means securing said topvplates in position.

- signature. f

FRED HUFNAGEL. 

